Oddity Central reports that the Sensoji Temple in Tokyo, Japan, has held an annual festival for the past four hundred years that encourages babies to cry in order to improve their health:

Amateur sumo wrestlers hold the babies high in the air, and try to scare them into crying, while a sumo referee judges the match. The toddler who cries longest and loudest is considered the winner.

Japanese parents bring the babies to the contest, of their own free will, and truly believe the sumo induced crying keeps their children in good health, and wards off evil spirits. This year, 80 babies, all under one year old, participated in Naki Sumo. As you might have guessed, the whiniest contender won.